Sectional concrete pipe and method of making same.



- A. M. HIRSH.

SBGTIONAL CONCRETE PIPE AND METHOD OF MAKING SAME.

' APPLIOATION'IILBD MAB-.12, 1909.

1,004,570. Patented 0013,1911.

* UNITED STATES PATENT OFFICE. AI-LAN marten, or nonrcnam, imw mnsmr, assrenon' 'ro LOCK oom'r PIPE i couramr, or new Yonx, n. x aconromrron-or New mnsnx.

SECTIONAL CONCRETE PIPE AND METHOD OF MAKING SAME.

Specification of Letters Patent.

Patented Oct. 3, 1911'.

Application filed latch 12, 1909. Serial No. 482,958.

To all whom it may concern:

Be it known that I, ALLAN M. Hmsn, a citizen of the United States, residing at Montclair, county .of Essex, and State of New Jersey, have invented certain new and useful Improvements in Sectional Concrete Pipes and Methods of Making Same, of.

exact description.

My invention relates to sectional concrete pipes or conduits, and pertainsmore particularl to the joint between the sectlons. In wor of this kind the pipe sections are commonly constructed with so-called bell and spigot ends, that is, each section has a reduced end which enters and is secured which. the following is a full, clear, and

in the internally rabbeted end of the adi fill the upper part of'the groove effectively,

even when the pipe is large enough in diameter to permlt a workman to enter the same and work in a sitting or standing posture, and, it is therefore the object of my present invention to construct the tions in such manner as to avoid t e necessity of working from the inside to fill the upper part of the groove; in other words, to permit the upper part to be filled from the outside of the pipe.

In the annexed drawing I have illustrated the preferred form of the invention, and referring now thereto, Figures 1 .and 2 are perspective views of' the bell and spigot 40 ends, respectively, of my improved concrete pipe. Fig. 3 is a side elevational view Show ing two sections assembled with the upper part of thegroove or key-space unfilled. Fig. 4 is a longitudinal section showing two sections assembled,'with the key-space filled. Fig. 5' isa transverse section showing the inner form or centering, which closes the bottom of the upper art of the key-space, in position for the eposit of concrete in 5 said space.

The pipe sections, two of which are shown at 1, 2, are formed bymoldin in the usual way, and may be of any suitab e form in cross section, for example cylindrical, as

5 shown. One end of each section is formed ipe sec-- leaving the with an axially extending rim or lip 3, around lts inner circumference, said lip 01' extension hem? tapered on its outer surface as shown an constituting the spigot. The other section, 2, which is to be connected to the spigot .end .of the first, has an outer 11p 01'' extension 4, on the lower side of the section only, said outer lip or flange extending more or less than half around the c rcumference ofthe pipe, as may be de- 5 sired, and constituting the bell. The upper part is cut away so as to leave a space between the two sections, as clearly shown in Fig. 3 and around the edge, of the cut away part the pipe section has a shallow roove, as shown at 5, Fig. 4. The lip or ange 3, constituting the spigot, is shorter than the hell 4, so as to leave a groove (3, Fig. 4, on the inside at the bottom of the two sections, and the inner edges of the sections are inclined so as to give an under-cut to the groove, as shown in the figure just mentioned.

Embedded in each'section is a suitable meshed reinforcement, 7, preferably a layer so of so-called expanded metal, the ends of which project from the edge or body of the pipe inside the bell 4', and from the spigot 3, so as to overlap when the two sections are placed together, as in Fig. 3. 5

The two sections being assembled in the manner shown, the groove inside the pipe is packed full of concrete, embedding the overlapping reinforcing fabrics. An inner form or centering is next placed in position to close the bottom of the open space at the top of the ipe. This centering consists preferably 0 two radial members 8, 9, crossing each other at right angles and a curved plate 10, of suitable material supported thereon and braced by radial members 11. The centering being placed in position and raised firmly against the top of the pipe by a wedge 12 driven under the foot of the up;

right member 9, the channel or space at the top of the pi e can be packed full of con-. crete from t e outside with the greatest convenienceand despatch. When the filling has set the inner centering is removed, ipe sections effectively bound together by t e engagement of the concrete key with the overlapping meshed fabric used as the reinforcement. The centering leaves the inner surface of the pipe smoot and clearat the top, and of course the con- 110 crete in the groove at the bottom can be smoothed off while still soft, by means of any suitable implement. The joint between the two sections having been completed, a third section can be secured to either ofsthe first two in the same manner, and so onuntil as many sections as desired are assem bled.

Itvwill be noted that the concrete deposited in the inner at the topo the pipe is continuous or unbroken around the circumference of the pipe,

thus in fact constituting a monolithic keyclear through the pipe-wall as in my construction.

lVhat I claim is: l

1. The herein described method of making sectional concrete pipe, which consists in forming" pipe-sections with a bell-end having the upper portion of the bell cut away and with a spigot end shorter than the bell, and with a meshed reinforcing fabric projecting out of the spigot at one end and out of the body of the section, within the bell, at the other end; assembling the sections with the spigot of one extending into the bell of the other, with the projecting meshed reinforcing fabrics overlapping in the groove formed inside the pipe at the bottom between-the spigot of the one section and the body of'the other and in the open space left by the cut-away bell at. the

top; filling the said groove with concrete from the inside of the pipe and embedding the meshed reinforcing fabrics overlapping therein; arranging a centering or temporary closure atthe bottom of said open space to close same at the lnside of the pipe; filling said space with concrete from outside the pipe and embedding the meshed reinforcing fabrics overlapping therein; allowing the embedding concrete to set; and removing the centering or temporary closure; substantially as described and for the purposes set forth. 1

2. The herein-described sectional concrete pipe, comprising a pipe-section having at one end a hell with the upper part thereof cut away; a pipe section having at one end a short spigot extending into the bell on the other section, and leaving 'a groove at the bottom on the inside of the pipe and an open space at the top, said sections having. I

' and space an oove 6 and in'the open space.

embedded meshed reinforcing fabrics projecting into said groove and spaeefllalnd overlapping therein; and a 'circumferentially continuous keg embedding the meshed reinforcing fabrics overlappin therein; substantially as described and or the purposes set forth.

3. The hereinsdescribed sectional concrete pipe, comprising a pipe section having at one end a bell with the upper partcut away; a pipesection having at one end a short spigot extending into the hell on the other section, and leaving a groove at the bottom on the inside of the pipe and an open space at the top, the groove at the bottom registering with the space at the top,-said' groove and space being filled with concrete thereby forming a monolithic key. i

4. The herein described method of making a pipe joint which consists in forming one section of a pipe with a bell end havin the upper portion thereof cut away, and orming the abutting section with a spigot end shorter than the bell; assembling the sections whereby a groove is left in the bottom defined by -the projecting portionof the bell and by the short spigot, said groove below being continuous with .the space above; fill-' of concrete filling said groove ing the groove below then filling the space 4 above with concrete; and then allowing the concrete to set, thereby producing a monolithic key ;substantially as described and for the purpose set forth.

5. The herein described method of making a pipe joint which consists in forming one section with a bell and having the upper portion cut away and with -a spigot end shorter than the bell and with a meshed're inforcing fabric projecting out of the spigot at one end and out of the body of the section within the bell at the other end; assembling the sections with the spigot of one'extending into the bell of the other with the projecting fabrics from the sections overlapping each other; filling the groove with concrete from.the inside of the pipe and embedding the overlapping reinforcing fabrics therein, and filling the said space on the outside with concrete embedding the overlapping reinforcing fabrics therein; and then allowing the concrete to set; substantially as described and for the purpose set forth.

In testimony whereof I affix my signature in the-presence of two subscribing witnesses.

ALLAN M. HIBSH.

Witnesses:

M. LAwsoN DYER,

S. S. DUNHAM. 

